Mrs.D Math · 6th Grade

QUAD
SQUAD

Geometry · Area of Quadrilaterals
ⶁ Parallelograms
⏢ Trapezoids
▭ Rectangles
🔹 Quadrilaterals
ⶁ A = b × h
⏢ A = ½(b₁+b₂)h
▭ A = l × w
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📚 Area of Quadrilaterals

ⶁ Parallelogram — A = b × h

Slice off the triangle end and slide it over — you get a rectangle! That’s why the formula is base × height, just like a rectangle.

1
Find the base and the height. The height is perpendicular to the base — not the slanted side!
b = 12 cm, h = 4 cm
2
Multiply: A = b × h
A = 12 × 4 = 48 cm²

⏢ Trapezoid — A = ½(b₁ + b₂) × h

Two copies of a trapezoid fit together to make a parallelogram — so a trapezoid is half of one!

1
Add the two bases (the parallel sides).
b₁ + b₂ = 8 + 12 = 20
2
Take half, then multiply by the height.
A = ½ × 20 × 5 = 50 cm²

How to Play

ⶁ
Parallelograms — Practice A = b × h.
⏢
Trapezoids — Practice A = ½(b₁+b₂)h.
🎲
Mixed — Both shapes together! Some questions are multiple choice, some you type the answer.
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